Screen quick-change type sand screening device

Abstract

The invention discloses a screen quick-change type sand screening device which comprises a rack, a mounting frame is elastically connected to the rack through an elastic piece, a mounting groove suitable for placing a screen is formed in the end face of the mounting frame, a plurality of pressing pieces are arranged on the mounting frame in the circumferential direction of the mounting groove, and the pressing pieces are used for pressing the screen in the mounting groove. And a vibrating mechanism is arranged on the screen or the mounting frame. And the screen mesh can be taken out from the mounting frame and replaced by loosening the pressing piece, and the replaced screen mesh can also be conveniently pressed in the mounting groove through the pressing piece. Compared with the prior art, when the screen of the sand screening device is replaced, disassembly between the mounting frame and the rack does not need to be operated, so that replacement of the screen is more convenient.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular, relates to a screen quick-change type sand screening device. BACKGROUND

[0002] In the process of urban rapid development, the construction industry is also developing rapidly, and a large amount of sand is needed during construction in the construction industry. The sand screening process is an indispensable part in the construction engineering and various building materials, cement and other industries. The core is to remove impurities in sand and gravel through a sand screening device to ensure the purity and quality of production materials and meet the daily production demand in terms of efficiency.

[0003] A typical sand screening device includes a rack and a screen connected to the rack by an elastic member. For example, a vibrating motor is usually provided on the screen. The vibrating motor drives the screen to vibrate by using a rotating eccentric block, and the sand screening is realized under the action of the vibrating force. However, when different sand screening processes are needed, the screen needs to be replaced, at which time the entire frame of the screen needs to be removed from the rack, causing inconvenience in replacement. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and provide a screen quick-change type sand screening device.

[0005] The purpose of the present application is achieved by the following technical solutions: A screen quick-change type sand screening device includes a rack, an installation frame connected to the rack by an elastic member, an installation slot on the end face of the installation frame for placing the screen, a plurality of pressing members arranged along the circumference of the installation slot on the installation frame, the pressing members being used to press the screen to the installation slot, and a vibrating mechanism provided on the screen or the installation frame.

[0006] Preferably, the pressing member includes a rotatably arranged pressing block.

[0007] Preferably, the vibrating mechanism includes a vibrating motor.

[0008] Preferably, the installation frame is vertically slidably adapted to the rack; the vibrating mechanism includes a motor arranged above the screen and a driving disc provided on the rotating shaft of the motor, the bottom surface of the driving disc is ball-jointed with a driving rod, the end of the driving rod away from the driving disc is ball-jointed with the screen, and the ball-jointing points of the driving rod and the driving disc are eccentrically arranged.

[0009] Preferably, an adjusting seat is movably arranged on the screen along the radial direction, and the end of the driving rod is ball-jointed with the adjusting seat.

[0010] Preferably, the adjusting seat is moved along the radial direction by a lead screw mechanism.

[0011] Preferably, the mounting frame is tilted so that the screen forms a dropping angle with the ground; the adjusting seat is slidably configured along the tilting direction of the mounting frame, and an elastic member is connected between the adjusting seat and the screen, and the elastic member is adapted to tend to keep the adjusting seat in an initial position; an adjusting plate is also slidably connected to the screen, and a material passing gap is formed between the adjusting plate and the screen; a connecting member is provided between the adjusting plate and the adjusting seat; when the material exceeding the threshold pushes the adjusting plate down, the adjusting seat slides to increase the maximum projection distance between the two ends of the driving rod in the vertical direction during the rotation of the driving disk.

[0012] Preferably, two adjusting plates are provided, which are a first adjusting plate provided in the middle of the screen and a second adjusting plate provided at the bottom of the screen; a first connecting member is provided between the first adjusting plate and the adjusting seat, and a second connecting member is provided between the second adjusting plate and the adjusting seat; a guide wheel is provided for rotation at the top of the screen, and the first connecting member includes a cable, which extends upward, passes around the guide wheel and is downwardly connected to the adjusting seat; a first knocking mechanism and a second knocking mechanism are also provided on the screen, the first knocking mechanism is opposite to the top of the screen, and the second knocking mechanism is opposite to the bottom of the screen; a first trigger mechanism and a second trigger mechanism are respectively provided at the upper and lower ends of the adjusting seat, and when the adjusting seat is coupled to the first trigger mechanism, the first knocking mechanism knocks on the top of the screen; when the adjusting seat is coupled to the second trigger mechanism, the second knocking mechanism knocks on the bottom of the screen.

[0013] Preferably, the first trigger mechanism and the second trigger mechanism both include contact switches, and the first knocking mechanism and the second knocking mechanism both include pneumatic or electric knocking hammers.

[0014] Preferably, the first trigger mechanism and the second trigger mechanism both include a trigger rod that can be elastically arranged, and the first knocking mechanism and the second knocking mechanism both include a hydraulic hammer, and the sliding cavity of the trigger rod is connected to the hydraulic cavity pipeline of the hydraulic hammer; when the adjustment seat is in the initial position, the circumferentially swinging driving rod does not contact the two trigger rods; when the adjustment seat moves upward, the circumferentially swinging driving rod can push the trigger rod of the first trigger mechanism to bounce; when the adjustment seat moves downward, the circumferentially swinging driving rod can push the trigger rod of the second trigger mechanism to bounce.

[0015] The beneficial effects of the present invention are: 1. The screen can be removed from the mounting frame and replaced by loosening the clamping piece. The replaced screen can also be conveniently pressed into the mounting slot by the clamping piece. Compared with the prior art, the sand screening device of the present invention does not require disassembly between the mounting frame and the frame when replacing the screen, making screen replacement more convenient.

[0016] 2. The vibration mechanism consists of a motor, a drive plate, and a drive rod. The eccentric rotation of the drive plate drives the mounting frame and screen to vibrate vertically. Unlike a vibrating motor, the material is less susceptible to back-throwing forces on the screen, making it less likely for the material to remain on the screen for an extended period.

[0017] 3. The driving disc can be adjusted in radial direction so that the driving rod can act on the screen with different vibration amplitudes. For example, a greater vibration force can be applied to the screen to improve the screening performance, or a larger amplitude can be used to throw out the material blocked in the sieve holes of the screen. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the side projection structure of the embodiment; Figure 2 It is a schematic diagram of the vertical projection structure of the embodiment; Figure 3 It is a structural diagram of the adjustment seat and the screw mechanism; Figure 4 is a schematic diagram of the transverse cross-sectional structure of an embodiment; Figure 5 Schematic diagram of the structure of the first adjustment plate and the second adjustment plate; Figure 6 for Figure 5 A magnified view of part A; Figure 7 It is a schematic diagram of the longitudinal cross-sectional structure of the embodiment; Figure 8 It is a structural schematic diagram of the driving rod in one swinging state; Figure 9 It is a structural schematic diagram of another swinging state of the driving rod.

[0019] Figure markings: 1. Frame; 2. Mounting frame; 3. Mounting groove; 4. Pressing member; 5. Vibrating mechanism; 6. Pressure block; 7. Driving disk; 8. Driving rod; 9. Adjusting seat; 10. Screw mechanism; 11. First adjusting plate; 12. Second adjusting plate; 13. First connecting member; 14. Second connecting member; 15. Guide wheel; 16. First knocking mechanism; 17. Second knocking mechanism; 18. First triggering mechanism; 19. Second triggering mechanism; 20. Contact switch; 21. Triggering rod; 22. Hydraulic hammer; 23. Screen; 24. Connecting frame; 25. Pipeline. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work shall fall within the scope of protection of the present invention.

[0021] See also Figures 1 to 3 A quick-change screen sand screening device includes a frame 1, to which a mounting frame 2 is resiliently connected via elastic members such as springs. Several elastic members are arranged substantially evenly along the circumference of the mounting frame 2, so that the mounting frame 2 is supported substantially parallel to the frame 1. A mounting groove 3 is specifically constructed on the end surface of the mounting frame 2, into which a screen 23 is inserted in a manner adapted to fit within the mounting groove 3. Furthermore, several pressing members 4 are provided on the mounting frame 2 along the circumference of the mounting groove 3, by which the screen 23 can be pressed against the mounting groove 3.

[0022] When the sand screening process changes, the operator can easily loosen the pressing member 4 to remove and replace the screen 23, and then reuse the pressing member 4 to press the replaced screen 23 into the installation groove 3. For example, the pressing member 4 may preferably include a rotatably arranged pressing block 6. When the screen 23 needs to be removed, the pressing block 6 can be screwed out to the side away from the installation groove 3, and the screen 23 can be removed after it is no longer stopped by the pressing block 6; similarly, when the pressing block 6 is screwed into the installation groove 3, the pressing block 6 will abut against the top surface of the frame of the screen 23, so that the screen 23 is confined in the installation groove 3. In other examples, the pressing member 4 can also be a fastening bolt.

[0023] See also Figure 1 、 Figure 2 A vibration mechanism 5 is provided on the screen 23 or the mounting frame 2. For example, the vibration mechanism 5 can be a vibration motor. The vibration of the vibration motor causes the screen 23 to vibrate, thereby vibrating and screening the sand and gravel fed into the screen 23 by an excavator or hoist. Fine sand in the sand and gravel passes through the screen 23 and is discharged downward, while gravel in the sand and gravel is retained on the screen 23. For example, if the mounting frame 2 is tilted so that the screen 23 forms a drop angle with the ground, the gravel retained on the screen 23 will roll down along the screen 23 to the ground under the action of gravity.

[0024] See also Figure 1 、 Figure 3 、 Figure 4As another configuration, the mounting frame 2 is preferably adapted to slide vertically relative to the frame 1. For example, the frame 1 may be provided with sliding posts, and the sliding holes of the mounting frame 2 are adapted to slide within the sliding posts. The elastic member may also be preferably sleeved onto the outside of the sliding posts. It will be appreciated that in this case, the mounting frame 2 can only move vertically relative to the frame 1, while longitudinal and lateral movement is restricted. See also Figure 3 、 Figure 4 The vibrating mechanism 5 preferably includes a motor mounted above the screen 23 via a connecting frame 24, and a drive disk 7 mounted on the motor's rotating shaft. A drive rod 8 is connected between the drive disk 7 and the screen 23. One end of the drive rod 8 is ball-jointed to the bottom surface of the drive disk 7, while the other end is ball-jointed to the screen 23. The ball joint of the drive rod 8 on the drive disk 7 is eccentrically positioned. During sand screening, the motor rotates the drive disk 7, and the eccentric rotation of the drive rod 8 causes the mounting frame 2 and the screen 23 to vibrate back and forth vertically, thereby achieving vibratory screening of the sand and gravel on the screen 23.

[0025] In a preferred example, an adjustment seat 9 is movably provided on the screen 23 in the radial direction, and the wording "radially" here refers to the drive disk 7, that is, the adjustment seat 9 can move to change the distance between it and the center of the drive disk 7. The above-mentioned drive rod 8 is specifically connected to the adjustment seat 9. It can be imagined that after the adjustment seat 9 moves, the maximum vertical projection distance between the top end of the drive rod 8 and the bottom end of the drive rod 8 will change during the process of the drive disk 7 being driven to rotate by the motor. For example, when the adjustment seat 9 moves further away from the center of the drive disk 7, the above-mentioned maximum projection distance will also increase accordingly, and at this time, the vibration amplitude of the screen 23 in the vertical direction will also increase.

[0026] For example, as the screening operation progresses, if the screen 23 becomes clogged, causing the screening quality to decline, the adjustment seat 9 can be driven to move away from the center of the drive disk 7 as described above, and the screen 23 can then be vibrated with a greater amplitude to eject particles clogged in the meshes of the screen 23. In another case, the radial position of the adjustment seat 9 can be appropriately selected so that the screen 23 can obtain an appropriate vibration force to screen different materials. For example, the greater vibration force of the screen 23 can be used to screen high-humidity or high-viscosity materials, as this will help break up material agglomerations and promote particle separation and screening.

[0027] See also Figure 3 In some embodiments, a screw mechanism 10 may be provided on the screen 23, and the adjustment seat 9 may be provided on the transfer end of the screw mechanism 10. The screw mechanism 10 is a common transfer mechanism in the prior art and will not be described in detail here. In other possible implementations, radial transfer of the adjustment seat 9 may also be achieved using a pneumatic cylinder or a hydraulic cylinder.

[0028] See alsoFigure 5 In other embodiments, the adjustment seat 9 is slidably adapted along the tilt direction of the mounting frame 2 via a mechanism such as a track or a slide groove, and an elastic member is connected between the adjustment seat 9 and the screen 23. Under the elastic force of the elastic member, the adjustment seat 9 always tends to remain in an initial position, for example, the initial position can be the center of the screen 23. An adjustment plate is also slidably connected to the screen 23 along the tilt direction of the mounting frame 2, and a material passing gap is formed between the adjustment plate and the screen 23.

[0029] The adjustment plate can be slidably adapted to the mounting frame 2 via a slide rail or a slide groove, or the adjustment plate can also be slidably arranged on the screen 23 in an integrated manner by also utilizing a slide rail or a slide groove.

[0030] During normal screening operations, fine sand in the sand and gravel will smoothly pass through the screen 23, allowing the sand and gravel discharged to the side of the adjustment plate to have a flow rate within the threshold and smoothly pass through the material gap until it flows to the ground. However, when the screen 23 becomes clogged, the fine sand in the sand and gravel cannot normally pass through the screen 23, causing the flow rate of sand and gravel flowing to the side of the adjustment plate to exceed the threshold. As the sand and gravel accumulate above the adjustment plate, the sand and gravel will push the adjustment plate downward, and then the connecting parts on the adjustment plate will synchronously pull the adjustment seat 9 to slide, especially driving the adjustment seat 9 to slide away from the center of the drive disk 7, so that the amplitude of the screen 23 increases, achieving self-cleaning of the screen surface.

[0031] After the above-mentioned blockage fault is eliminated, as the fine sand in the sand and gravel passes through the screen smoothly, the sand and gravel accumulated above the adjusting plate gradually decreases, and the adjusting seat 9 and the adjusting plate gradually return to their initial positions under the action of the elastic member, and then the screen 23 can continue to screen sand using appropriate vibration force.

[0032] In a possible approach, a knocking mechanism can be provided at the bottom or top of the screen 23 to knock the screen 23 when a blockage occurs, making it easier to knock out particles stuck in the screen holes. However, the inventors have further discovered that the blockage area of ​​the screen 23 is regional, and conventional knocking mechanisms are difficult to achieve more targeted knocking on the screen 23, resulting in poor knocking and discharge effects.

[0033] In this regard, the present disclosure preferably provides two adjustment plates, and two knocking mechanisms are also provided on the screen 23. Figure 5 The two adjustment plates are defined as the first adjustment plate 11 and the second adjustment plate 12, respectively. The first adjustment plate 11 is specifically adapted to the middle of the screen 23, and the second adjustment plate 12 is specifically adapted to the bottom of the screen 23; the two knocking mechanisms are defined as the first knocking mechanism 16 and the second knocking mechanism 17, respectively. The first knocking mechanism 16 is opposite to the top of the screen 23, and the second knocking mechanism 17 is opposite to the bottom of the screen 23.

[0034] Correspondingly, a first connecting member 13 is connected between the first adjustment plate 11 and the adjustment seat 9, while a second connecting member 14 is connected between the second adjustment plate 12 and the adjustment seat 9. The two connecting members can adopt the same structure, but the first connecting member 13 is preferably a cable. In addition, a guide wheel 15 is rotatably provided on the top of the screen 23. The cable extends upward, passes around the guide wheel 15, and then connects downward to the adjustment seat 9.

[0035] It can be imagined that when the top area of ​​the screen 23 is blocked, the sand and gravel flow exceeding the threshold flow rate will push the first adjustment plate 11 downward. At the same time, under the pull of the first connecting member 13, the adjustment seat 9 will move upward and gradually move away from the center of the driving disk 7, and the amplitude of the screen 23 will increase synchronously; similarly, when the bottom area of ​​the screen 23 is blocked, the sand and gravel flow exceeding the threshold flow rate will push the second adjustment plate 12 downward. At this time, the adjustment seat 9 moves downward under the pull of the second connecting member 14, so that the amplitude of the screen 23 also increases.

[0036] See also Figure 6 A first trigger mechanism 18 and a second trigger mechanism 19 are respectively provided at the upper and lower ends of the adjustment seat 9. When the adjustment seat 9 moves upward, the adjustment seat 9 is coupled to the first trigger mechanism 18, and then the first knocking mechanism 16 responds to the triggering of the first trigger mechanism 18 and knocks the top of the screen 23; similarly, when the adjustment seat 9 moves downward, the adjustment seat 9 is coupled to the second trigger mechanism 19, and then the second knocking mechanism 17 responds to the triggering of the second trigger mechanism 19 and knocks the bottom of the screen 23.

[0037] In a possible example, the first trigger mechanism 18 and the second trigger mechanism 19 can both be contact switches 20 or infrared sensors, while the first striking mechanism 16 and the second striking mechanism 17 can be pneumatic or electric striking hammers. For example, the two trigger mechanisms can sense the upward or downward movement of the adjustment seat 9 and start and stop the two striking mechanisms under the control signal of the controller to achieve regionalized, automated, and more targeted striking of the screen 23.

[0038] See also Figure 5 、 Figure 7 As another configuration, both trigger mechanisms include a trigger rod 21 that can be elastically arranged, and both striking mechanisms include a hydraulic hammer 22, and the sliding cavity of the trigger rod 21 is connected to the hydraulic cavity of the corresponding hydraulic hammer 22 through a pipe 25. Figure 7 When the screen 23 screens sand with an appropriate vibration force, the adjustment seat 9 is correspondingly located at an initial position closer to the center of the driving disk 7. At this time, the circumferentially swinging driving rod 8 does not contact the two trigger rods 21.

[0039] See also Figure 8When the top of the screen 23 is blocked and the adjustment seat 9 moves upward, the circumferentially swinging driving rod 8 can push the trigger rod 21 of the first trigger mechanism 18 to bounce, and then the hydraulic oil in the sliding cavity of the trigger rod 21 will be pressed into the hydraulic hammer 22 of the first knocking mechanism 16, thereby allowing the hydraulic hammer 22 to complete the knocking of the top area of ​​the screen 23.

[0040] See also Figure 9 When the bottom of the screen 23 is blocked and the adjustment seat 9 moves downward, the circumferentially swinging driving rod 8 can push the trigger rod 21 of the second trigger mechanism 19 to bounce, and then the hydraulic oil in the sliding cavity of the trigger rod 21 will be pressed into the hydraulic hammer 22 of the second knocking mechanism 17, thereby allowing the hydraulic hammer 22 to complete the knocking of the bottom area of ​​the screen 23.

[0041] It can be understood that in this configuration, the trigger mechanism and the cooperation of the different states of the driving rod 8 can realize the automatic execution of the knocking action of the corresponding knocking mechanism, and the process does not require electronic control and is more mechanically reliable.

[0042] For example, the end of the trigger rod 21 may preferably be configured to have an arc or an inclined surface, so as to more smoothly facilitate the abutment between the driving rod 8 and the trigger rod 21 and the thrust of the driving rod 8 on the trigger rod 21 .

[0043] In a preferred embodiment, a locking mechanism (not shown) may be provided on the track or chute below the adjustment seat 9 to limit the upward return of the adjustment seat 9. For example, the locking mechanism may be a ratchet and pawl structure (not shown). The pawl may be provided on the side wall of the adjustment seat 9, while the ratchet may be provided on the inner wall of the chute. The pawl allows the adjustment seat 9 to move downward in a resilient manner. However, when the adjustment seat 9 tends to move upward, the locking of the pawl and the ratchet restricts the movement of the adjustment seat 9, thereby limiting the upward return tendency of the adjustment seat 9. The present disclosure may have the following exemplary usage scenarios: 1. When the first adjustment plate 11 is pushed downward and the adjustment seat 9 is moved upward, an alarm (not shown) or manual observation can be used to warn on-site workers that the aperture of the screen 23 may be too small, so that the screen 23 can be replaced in time.

[0044] 2. When the second adjustment plate 12 is pushed downward and the adjustment seat 9 moves downward, it can be determined that the vibration force of the screen 23 is too small. However, since the adjustment seat 9 is kept in the downward position by the locking mechanism, the screen 23 will screen sand with a larger amplitude.

[0045] In the first scenario described above, due to the inappropriate pore size of the screen 23, sand and gravel that fall through the screen 23 are more likely to cause blockage in the upper area of ​​the screen 23. In the second scenario, the pore size of the screen 23 is appropriate, and the fine sand in the sand and gravel that enter the upper area of ​​the screen 23 will mostly pass through the screen 23, less likely to cause blockage. However, due to the insufficient vibration force, the fine sand cannot completely penetrate the screen, ultimately causing the sand and gravel flow exceeding the threshold flow rate to push the second adjustment plate 12 downward. In one example, the trigger rod 21 of the second trigger mechanism 19 does not adopt a spring-loaded design, but instead remains in a retracted position after a single push by the drive rod 8, thereby avoiding prolonged contact with the drive rod 8.

[0046] The foregoing description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Rather, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the appended claims.

Claims

1. A quick-change screen sand screening device, comprising a frame (1), characterized in that: The frame (1) is movably connected to a mounting frame (2) via an elastic member. An end surface of the mounting frame (2) is provided with a mounting groove (3) suitable for placing a screen. The mounting frame (2) is provided with a plurality of pressing members (4) along the circumference of the mounting groove (3). The pressing members (4) are used to press the screen against the mounting groove (3). A vibration mechanism (5) is provided on the screen or the mounting frame (2).

2. The quick-change screen sand screening device according to claim 1, characterized in that: The pressing member (4) comprises a rotatably arranged pressing block (6).

3. The quick-change screen sand screening device according to claim 1 or 2, characterized in that: The vibration mechanism (5) includes a vibration motor.

4. The quick-change screen sand screening device according to claim 1 or 2, characterized in that: The mounting frame (2) is slidably adapted to the frame (1) in the vertical direction; The vibration mechanism (5) comprises a motor mounted above the screen and a drive disk (7) arranged on the rotating shaft of the motor, a drive rod (8) being ball-connected on the bottom surface of the drive disk (7), an end of the drive rod (8) away from the drive disk (7) being ball-connected to the screen, and a ball connection point between the drive rod (8) and the drive disk (7) being eccentrically arranged.

5. The quick-change screen sand screening device according to claim 4, characterized in that: An adjustment seat (9) is provided on the screen so as to be movable in the radial direction, and the end of the driving rod (8) is ball-connected to the adjustment seat (9).

6. The quick-change screen sand screening device according to claim 5, characterized in that: The adjustment seat (9) is moved in the radial direction via a screw mechanism (10).

7. The quick-change screen sand screening device according to claim 5, characterized in that: The mounting frame (2) is tilted so that the screen forms a falling angle with the ground; The adjustment seat (9) is slidably arranged along the tilting direction of the mounting frame (2), and an elastic member is connected between the adjustment seat (9) and the screen, and the elastic member is adapted to tend to keep the adjustment seat (9) in an initial position; The screen is also slidably connected to an adjustment plate, and a material passing gap is formed between the adjustment plate and the screen; A connecting piece is provided between the adjustment plate and the adjustment seat (9); When the material exceeding the threshold value pushes the adjustment plate downward, the adjustment seat (9) slides to increase the maximum vertical projection distance between the two ends of the driving rod (8) during the rotation of the driving disc (7).

8. The quick-change screen sand screening device according to claim 7, characterized in that: There are two adjustment plates, which are a first adjustment plate (11) arranged in the middle of the screen and a second adjustment plate (12) arranged at the bottom of the screen; A first connecting member (13) is provided between the first adjusting plate (11) and the adjusting seat (9), and a second connecting member (14) is provided between the second adjusting plate (12) and the adjusting seat (9); A guide wheel (15) is rotatably provided on the top of the screen, and the first connecting member (13) includes a cable, which extends upward, passes around the guide wheel (15), and is then connected downward to the adjustment seat (9); The screen is further provided with a first knocking mechanism (16) and a second knocking mechanism (17), wherein the first knocking mechanism (16) is opposite to the top of the screen, and the second knocking mechanism (17) is opposite to the bottom of the screen; A first trigger mechanism (18) and a second trigger mechanism (19) are respectively provided at the upper and lower ends of the adjustment seat (9); when the adjustment seat (9) is coupled to the first trigger mechanism (18), the first knocking mechanism (16) knocks the top of the screen; when the adjustment seat (9) is coupled to the second trigger mechanism (19), the second knocking mechanism (17) knocks the bottom of the screen.

9. The quick-change screen sand screening device according to claim 8, characterized in that: The first trigger mechanism (18) and the second trigger mechanism (19) both include a contact switch (20), and the first knocking mechanism (16) and the second knocking mechanism (17) both include a pneumatic or electric knocking hammer.

10. The quick-change screen sand screening device according to claim 8, characterized in that: The first trigger mechanism (18) and the second trigger mechanism (19) both include a trigger rod (21) that can be elastically arranged, the first knocking mechanism (16) and the second knocking mechanism (17) both include a hydraulic hammer (22), and the sliding cavity of the trigger rod (21) is connected to the hydraulic cavity pipeline of the hydraulic hammer (22); When the adjustment seat (9) is in the initial position, the circumferentially swinging driving rod (8) does not come into contact with the two triggering rods (21); When the adjustment seat (9) moves upward, the circumferentially swinging driving rod (8) can push the trigger rod (21) of the first trigger mechanism (18) to bounce; When the adjustment seat (9) moves downward, the circumferentially swinging driving rod (8) can push the trigger rod (21) of the second trigger mechanism (19) to bounce.

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